package com.lagou.dao.impl;

import com.lagou.dao.CourseContentDao;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.utils.DateUtils;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.List;

public class CourseContentDaoImpl implements CourseContentDao {
    @Override
    public List<Course_Section> findSectionAndLessonByCourseId(int courseId) {

        try {
            // 1、 创建 queryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource()) ;

            // 2、编写sql语句
            String sql = "SELECT \n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_section WHERE course_id = ?";
            // 3、执行查询
            List<Course_Section> sectionList = qr.query(sql, new BeanListHandler<Course_Section>(Course_Section.class), courseId);

            // 4、根据章节ID查询课时信息
            for(Course_Section section : sectionList){

                // 调用方法 获取章节对应的课时
                List<Course_Lesson> lessonList = findLessonBySectionId(section.getId());

                //将课时数据封装到 章节对象中
                section.setLessonList(lessonList);
            }
            return sectionList;


        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }

    }

    @Override
    public List<Course_Lesson> findLessonBySectionId(int sectionId) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = "SELECT \n" +
                    "id,\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "STATUS\n" +
                    "FROM course_lesson WHERE section_id = ?";
            List<Course_Lesson> lessonList = qr.query(sql, new BeanListHandler<Course_Lesson>(Course_Lesson.class), sectionId);
            return lessonList;
        } catch (SQLException e)
        {
            e.printStackTrace();
            return null;
        }
    }

    @Override
    public Course findCourseByCourseId(int courseId) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "SELECT id,course_name FROM course WHERE id = ?";

            //3.执行查询
            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), courseId);

            //4.返回结果
            return course;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    @Override
    public int saveSection(Course_Section section) {
        try {
            // 1、 创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            // 2、编写sql
            String sql = "INSERT INTO course_section(" +
                    "course_id," +
                    "section_name," +
                    "description," +
                    "order_num," +
                    "STATUS," +
                    "create_time, " +
                    "update_time)\n" +
                    "VALUES(?,?,?,?,?,?,?);";

            // 3、准备参数
            //3.准备参数
            Object[] param = {section.getCourse_id(),section.getSection_name(),section.getDescription(),
                    section.getOrder_num(),section.getStatus(),section.getCreate_time(),section.getUpdate_time()};

            //4.执行插入
            int row = qr.update(sql, param);

            return row;
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    /**
     * 修改章节信息
     * @param section
     * @return
     */

    @Override
    public int updateSection(Course_Section section) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "UPDATE course_section SET\n" +
                    "section_name = ?,\n" +
                    "description = ?,\n" +
                    "order_num = ?,\n" +
                    "update_time = ? WHERE id = ?;";

            //3.准备参数
            Object[] param =
                    {section.getSection_name(),section.getDescription(),section.getOrder_num(),
                            section.getUpdate_time(),section.getId()};

            //4.执行修改操作
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    @Override
    public int updateSectionStatus(int id, int status) {

        try {
            //1、创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2、 编写sql
            String sql = "UPDATE course_section SET STATUS = ?,update_time = ? WHERE id = ?;";

            //3、准备参数
            Object[] param = {status, DateUtils.getDateFormart(), id};

            //4、执行修改操作
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    @Override
    public int saveLesson(Course_Lesson lesson) {

        try {
            // 1、创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            // 2、编写 sql
            String sql = "INSERT INTO course_lesson (\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\t\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "create_time,\n" +
                    "update_time)\n" +
                    "VALUES(?,?,?,?,?,?,?,?);";

            // 3、准备参数
            Object[] param = {lesson.getCourse_id(), lesson.getSection_id(), lesson.getTheme(),
                    lesson.getDuration(), lesson.getIs_free(), lesson.getOrderNum(),
                    lesson.getCreate_time(), lesson.getUpdate_time()};

            //4、 执行插入
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    @Override
    public int updateLesson(Course_Lesson lesson) {

        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            //2.编写SQL
            String sql = "UPDATE course_lesson SET \n" +
                    "course_id=?,\n" +
                    "section_id=?,\n" +
                    "theme=?,\t\n" +
                    "duration=?,\n" +
                    "is_free=?,\n" +
                    "order_num=?,\n" +
                    "update_time=?  WHERE id = ?;";

            //3.准备参数
            Object[] param =
                    {lesson.getCourse_id(),lesson.getSection_id(),lesson.getTheme(),
                            lesson.getDuration(),lesson.getIs_free(), lesson.getOrderNum(),
                            lesson.getUpdate_time(), lesson.getId()};

            //4.执行修改操作
            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }
}
